Our Providers

Get to know our team of highly trained and experienced professionals.

Dr. Esther Park, Child & Adult Psychiatrist

Esther Park, DO

Dr. Park is a board certified child & adolescent, and adult psychiatrist. She established Oak Health Center after recognizing the growing demand for great mental health providers. She trained to be a doctor at Kirksville College of Osteopathic Medicine, and did her psychiatry training at LAC/USC Medical Center. Dr. Park has more than ten years of outpatient clinical experience treating children and adults.

Dr. Stella Kim, Adult Psychiatrist

Stella Kim, MD

Dr. Kim is a board certified psychiatrist who treats adult patients. She earned her medical degree at Loma Linda University School of Medicine and completed her residency training at University of California, Irvine. She has been practicing psychiatry for more than 9 years. She is also a wife and mother of 2 children.

Dr. Steven Calleros, Child Psychiatrist

Steven Calleros, MD

Dr. Calleros is a board certified psychiatrist who specializes in treating children and adolescents. He earned his MD at Drexel University and did his psychiatry residency at LAC/USC Medical Center. He’s been treating clients in an outpatient setting for over 10 years. Dr. Calleros also speaks Spanish and is a husband and father.

Dr. Therese Mascardo, Clinical Psychologist

Therese Mascardo, PsyD

Dr. Therese is a clinical psychologist who is also an accomplished speaker and writer. She majored in psychology at UC Berkeley and earned her Doctor of Psychology degree at the California School of Professional Psychology. She has extensive experience working with people with disabilities and is a CAPED-certified learning disability specialist.

Joyce Yip Green, PhD, LMFT, ATR

Joyce Yip Green, PhD, LMFT, ATR

Joyce Yip Green is a licensed marriage and family therapist, art therapist, and international psychologist. She earned her PhD in International Psychology from The Chicago School of Professional Psychology and her Masters in Marital Family Therapy/Clinical Art Therapy from Loyola Marymount University. She has provided mental health counseling to individuals and families across the lifespan for the past 20 years in LA County, with specializations in infant and early childhood mental health.

Hanna Chung, LMFT

Hanna Chung, LMFT

Hanna is a licensed marriage and family therapist. She earned her degree in Psychology at UCLA, and her graduate degree at Fuller Theological Seminary. She has been treating individuals (children, adolescents, and adults) and families for over 7 years. Hanna also speaks Korean, and enjoys being a wife and mother.


Bethany Tucker, MD

Bethany Tucker, MD

Dr. Tucker is a board certified psychiatrist who treats adult patients. She earned her medical degree at University of Washington, School of Medicine and completed her residency training at University of Southern California, School of Medicine. She has been practicing psychiatry for more than 13 years.

Yvonne Miller, LMFT

Yvonne Miller, LMFT

Yvonne is a Licensed Marriage and Family Therapist, a Registered Play Therapist and is trained in providing EMDR therapy. She earned her Master’s degree in Marriage and Family Therapy at Hope International University, Fullerton, CA. Yvonne has engaged in extensive training in Play Therapy Principles and met the requirements from Association of Play Therapy (APT) to become a Registered Play Therapist. In addition Yvonne has been trained in EMDR therapy. Yvonne treats children, teens, adults and families and is passionate about helping others.


Emily Yee, MD

Emily Yee, M.D.

Dr. Yee is a board-eligible child & adolescent psychiatrist. She earned her medical degree at the University of Texas Health Science Center at San Antonio. She completed her residency, chief resident year, and fellowship training at the University of California, Irvine. She is also a wife and mother.


Christine Kim, NP

Christine Kim, N.P.

Christine is a board certified psychiatric mental health nurse practitioner. She earned her Masters of Science in Nursing degree at UCLA and a post-master’s certificate as a psychiatric mental health nurse practitioner at California State University, Long Beach. She has been a clinical nurse leader for 10 years. She treats children, adolescents, and adults, and speaks fluent Korean.

Helen Hyun, LMFT

Helen Hyun, LMFT

Helen is a former elementary school teacher. She is currently a licensed marriage and family therapist who earned her Masters of Science degree from Fuller Theological Seminary. She has been in therapeutic practice for over 8 years in an outpatient setting. She has experience in working with children, adolescents, adults, older adults, families, couples, crisis assessment and crisis response. She is also fluent In Korean and enjoys being a wife and mother to twins.


Julie Bellendir, NP

Julie Bellendir, N.P.

Julie is dual board certified as a psychiatric mental health nurse practitioner and a pediatric nurse practitioner. She has been a nurse for over 12 years and a nurse practitioner treating mental health clients in an outpatient setting for 6 years. Julie is also a wife and mother of two children.


Maria Garcia, LMFT

Maria Garcia, LMFT

Maria is a licensed marriage and family therapist who has been treating children, adolescents, and adults for 10 years. She earned her degree at California State University, Fullerton.

Care Coordinators

Meet our patient care coordinators who are committed to helping you get the treatment you need.

Donna Lee

Amelia Starr

Kristen Chun

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